CN102625457B - Transmission, reception and the transmission method and relevant apparatus of Downlink Control Information - Google Patents
Transmission, reception and the transmission method and relevant apparatus of Downlink Control Information Download PDFInfo
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Abstract
The present invention discloses a kind of transmission of Downlink Control Information, reception and transmission method and relevant apparatus, wherein, described sender method includes：On N number of subcarrier, Downlink Control Information is being sent to UE by physical downlink control channel PDCCH corresponding to subframe for base station；Wherein, N is positive integer, and the PDCCH is located on one or two time slot in subframe；When on the time slot that PDCCH is located in subframe, the time domain final position of the PDCCH is last OFDM symbol of the time slot, when on two time slots that PDCCH is located in subframe, the time domain final position of the PDCCH is last OFDM symbol of the subframe.By the present invention, realize under LTE indoor focus covering scene, carry out Downlink Control Information transmission and reception and monitoring, and the transmission of low overhead, rapid rate and high reliability can be realized.
Description
Technical Field
The present invention relates to the field of mobile wireless communications, and in particular, to a method and a related apparatus for transmitting, receiving and transmitting downlink control information in a wireless communication system.
Background
A radio frame (radio frame) in a Long Term Evolution (LTE) system includes frame structures of a Frequency Division Duplex (FDD) mode and a Time Division Duplex (TDD) mode. In the frame structure of the FDD mode, as shown in fig. 1, a 10 millisecond (ms) radio frame is composed of twenty slots (slots) with the length of 0.5ms and the number of 0-19, and the slots 2i and 2i +1 constitute a subframe (subframe) i with the length of 1 ms. In TDD mode, as shown in fig. 2, a 10ms radio frame is composed of two half-frames (half frames) with a length of 5ms, one half-frame includes 5 subframes with a length of 1ms, and subframe i is defined as 2 slots 2i and 2i +1 with a length of 0.5 ms. In both of the above frame structures, for a standard Cyclic Prefix (Normal CP), a slot contains 7 symbols with a length of 66.7 microseconds (us), wherein the CP length of the first symbol is 5.21us, and the length of the remaining 6 symbols is 4.69 us; for Extended Cyclic Prefix (Extended CP), one slot contains 6 symbols, and the CP length of all symbols is 16.67 us.
The version number of LTE corresponds to R8(Release 8), and its incremental version corresponds to a version number of R9(Release 9). The following three downlink physical control channels are defined in LTE: a physical downlink control Format Indicator Channel (PCFICH); a physical hybrid Automatic Retransmission Request Indicator Channel (PHICH); a Physical Downlink Control Channel (PDCCH).
The information carried by the PCFICH is used to indicate the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols for transmitting the PDCCH in one subframe, and is sent on the first OFDM symbol of the subframe, and the Frequency position of the first OFDM symbol is determined by the system downlink bandwidth and the cell Identity (ID).
The PHICH is used to carry acknowledgement/negative-acknowledgement (ACK/NACK) feedback information of uplink transmission data. The number and time-frequency position of the PHICH may be determined by a system message and a cell ID in a Physical Broadcast Channel (PBCH) of a downlink carrier where the PHICH is located.
The PDCCH is used for carrying Downlink Control Information (DCI), and includes: uplink and downlink scheduling information, and uplink power control information. The format of DCI (DCI format) is classified into the following: DCIformat 0, DCI format 1A, DCI format 1B, DCI format 1C, DCI format1D, DCI format 2A, DCI format 3, and DCI format 3A; wherein:
DCI format 0 is used to indicate scheduling of a Physical Uplink Shared Channel (PUSCH);
the DCI format1, DCI format 1A, DCI format 1B, DCI format 1C, and DCI format1D are used for different modes of one PDSCH codeword scheduling;
the DCI format 2 and the DCI format 2A are used for different modes of space division multiplexing;
the DCI format 3 and the DCI format 3A are used for different modes of a Physical Uplink Control Channel (PUCCH) and a power control command of the PUSCH.
Physical resources transmitted by a physical downlink Control channel PDCCH are in Control Channel Elements (CCEs) as a unit, the size of one CCE is 9 Resource Element Groups (REGs), that is, 36 Resource elements (Resource elements), and one PDCCH may occupy 1, 2, 4, or 8 CCEs. For the four PDCCH sizes occupying 1, 2, 4, 8 CCEs, tree-like Aggregation (Aggregation) is adopted, i.e. the PDCCH occupying 1 CCE may start from any CCE location; the PDCCH occupying 2 CCEs starts from an even CCE location; a PDCCH occupying 4 CCEs starts from an integer multiple of 4 CCE locations; PDCCHs occupying 8 CCEs start from CCE locations that are integer multiples of 8. In a radio frame, if a normal CP (Cyclic Prefix) is used, the first 1-3 OFDM symbols of the first slot of each subframe may carry Physical resources of a Physical Downlink Control Channel (PDCCH), and the remaining symbols may carry Physical resources of a Downlink Shared Channel (PDSCH), as shown in fig. 3.
Each Aggregation level (Aggregation level) defines a Search space (Search space) comprising a common (common) Search space and a User Equipment (UE) Specific (UE-Specific) Search space. The CCE number of the whole search space is determined by the number of OFDM symbols occupied by the control region indicated by the PCFICH in each downlink subframe and the number of PHICH groups. And the UE carries out blind detection on all possible PDCCH code rates in the search space according to the DCI format of the transmission mode.
In the k sub-frame, the control domain carrying PDCCH is numbered from a group of numbers 0 to NCCE，kN of-1CCE，kA number of CCEs. The UE should detect a group of candidate PDCCHs in each non-Discontinuous Reception (non-Discontinuous Reception) subframe to acquire control information, where the detection refers to decoding the PDCCHs in the group according to all DCI formats to be detected. The PDCCH candidates (PDCCH candidates) to be detected are defined in a search space, and an aggregation level (aggregation level) L ∈{1, 2, 4, 8}, search spaceIs defined by a set of PDCCH candidates (PDCCH candidates). Search spaceThe CCE corresponding to the PDCCH candidate (PDCCH candidate) m is defined by:
wherein i is 0, 1, M is 0, M(L)-1，M(L)For searching spaceThe number of candidate PDCCHs (PDCCH candidates) to be examined in the middle.
For common search space (common search space), YkL takes 4 and 8, 0.
For a UE-specific search space (UE-specific search space), L takes 1, 2, 4, 8.
Yk＝(A·Yk-1)modD，
Wherein Y is-1＝nRNTI≠0，A＝39827，D＝65537， Denotes rounding down, nsIs the slot number in a radio frame. n isRNTIIs a corresponding RNTI (Radio Network Temporary Identifier).
The UE should detect one common search space each with aggregation levels of 4 and 8 and one UE-specific search space each with aggregation levels of 1, 2, 4, 8, and the common search space and the UE-specific search space may overlap. The specific detection times and corresponding search spaces are shown in table 1:
TABLE 1
Due to the demand for indoor hotspot coverage technology, LTE hotspot coverage has gradually become a focus of discussion, which can be generally referred to as LTE-LAN (LTE-Local Area Networks). For the indoor hot spot coverage scenario, the design of the downlink control channel is still a problem to be solved, which also brings inconvenience to practical application.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a related device for transmitting, receiving and transmitting downlink control information, so as to solve the problem of how to transmit, receive and monitor downlink control information in an indoor hotspot coverage scenario of LTE.
In order to solve the above problem, the present invention provides a method for transmitting downlink control information, including:
a base station sends downlink control information to UE through a physical downlink control channel PDCCH on N subcarriers corresponding to a subframe;
wherein, N is a positive integer, and the PDCCH is positioned on one or two time slots in a subframe; when the PDCCH is positioned on one time slot in a subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the time slot, and when the PDCCH is positioned on two time slots in the subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the subframe.
Preferably, the transmission method has the following characteristics:
when the PDCCH is positioned on a first time slot of a subframe, the time domain starting position of the PDCCH is a first OFDM symbol of the first time slot of the subframe or an nth OFDM symbol of the first time slot of the subframe, and n is equal to an indicated value of a physical control format indicator channel of the subframe plus 1;
and when the PDCCH is positioned on the second time slot of the subframe, the time domain starting position of the PDCCH is the first OFDM symbol of the second time slot of the subframe.
Preferably, the transmission method has the following characteristics:
when the PDCCH is positioned on two time slots of a subframe, the time domain starting position of the PDCCH is the first OFDM symbol of the first time slot of the subframe or the nth OFDM symbol of the first time slot of the subframe, and n is equal to the indicated value of the physical control format indicator channel of the subframe plus 1.
Preferably, the transmission method has the following characteristics:
and the time-frequency resources used for sending the physical broadcast channel and the synchronous channel on the subframe are not used for sending the downlink control information.
Preferably, the transmission method has the following characteristics:
and the base station carries the shared channel scheduling information of the uplink service cell and/or the shared channel scheduling information of the downlink service cell in the downlink control information and sends the downlink control information to the UE.
Preferably, the transmission method has the following characteristics:
the base station carries the shared channel scheduling information of the downlink service cell in the downlink control information of the first time slot of the subframe, carries the shared channel scheduling information of the uplink service cell in the downlink control information of the second time slot of the subframe and sends the shared channel scheduling information of the downlink service cell to the UE;
or, the shared channel scheduling information of the downlink serving cell and the shared channel scheduling information of the uplink serving cell are carried in the downlink control information of the first or second time slot and sent to the UE.
Preferably, the transmission method has the following characteristics:
and the frequency domain position of the PDCCH adopts a distributed virtual resource block mode or a centralized virtual resource block mode.
Preferably, the transmission method has the following characteristics: the method is suitable for the LTE-LAN indoor hotspot coverage scene.
In order to solve the above problem, the present invention provides a method for receiving downlink control information, including:
and the UE monitors a Physical Downlink Control Channel (PDCCH) in a search space according to the aggregation level information and/or the PDCCH candidate number information configured by the high-level signaling to acquire downlink control information.
Preferably, the receiving method has the following characteristics:
when the UE monitors the PDCCH only according to the aggregation level information configured by the higher layer signaling,
the UE monitors the PDCCH according to the configured aggregation level information and the PDCCH candidate number corresponding to the aggregation level as in LTE or LTE-A; or,
and the UE allocates the corresponding PDCCH candidate number to the configured aggregation level according to the configured aggregation level information and the principle that the total PDCCH candidate number of all the aggregation levels is unchanged, and carries out PDCCH monitoring.
Preferably, the receiving method has the following characteristics:
when the UE monitors PDCCH only according to the PDCCH candidate number information configured by the high-layer signaling,
the PDCCH candidate number information is the total PDCCH candidate number of all aggregation levels, or the PDCCH candidate number information is the PDCCH candidate number corresponding to each aggregation level.
Preferably, the receiving method has the following characteristics:
when the UE monitors the PDCCH according to the aggregation level information and the PDCCH candidate number information configured by the higher layer signaling,
the base station informs the UE of the aggregation level information and the PDCCH candidate number information through two independent signaling; or the base station informs the UE of the aggregation level information and the PDCCH candidate number information through a joint coding signaling.
Preferably, the receiving method has the following characteristics:
and if the UE does not receive the high-level signaling sent by the base station on a subframe, monitoring the PDCCH according to the high-level signaling carrying the aggregation level information and/or the PDCCH candidate number information at the last time.
Preferably, the receiving method has the following characteristics:
the method is suitable for the LTE-LAN indoor hotspot coverage scene.
In order to solve the above problem, the present invention provides a method for transmitting downlink control information, including:
a base station sends downlink control information to UE through a physical downlink control channel PDCCH on N subcarriers corresponding to a subframe;
UE monitors a Physical Downlink Control Channel (PDCCH) in a search space according to aggregation level information and/or PDCCH candidate number information configured by a high-level signaling to acquire downlink control information;
wherein, N is a positive integer, and the PDCCH is positioned on one or two time slots in a subframe; when the PDCCH is positioned on one time slot in a subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the time slot, and when the PDCCH is positioned on two time slots in the subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the subframe.
In order to solve the above problems, the present invention provides a downlink control information transmitting apparatus,
the sending device is used for sending downlink control information to the UE through a Physical Downlink Control Channel (PDCCH) on N subcarriers corresponding to the subframes;
wherein, N is a positive integer, and the PDCCH is positioned on one or two time slots in a subframe; when the PDCCH is positioned on one time slot in a subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the time slot, and when the PDCCH is positioned on two time slots in the subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the subframe.
In order to solve the above problem, the present invention provides a receiving apparatus for downlink control information, which includes a monitoring module and a receiving module, wherein,
the monitoring module is used for monitoring a Physical Downlink Control Channel (PDCCH) in a search space according to aggregation level information and/or PDCCH candidate number information configured by a high-level signaling;
the receiving module is used for acquiring downlink control information according to the PDCCH monitored by the monitoring module.
By the method and the device, the downlink control information is transmitted, received and monitored in an indoor hot spot coverage scene of LTE, and low-overhead, high-speed and high-reliability transmission can be realized.
Drawings
Fig. 1 is a diagram illustrating a frame structure of an FDD mode in the prior art;
fig. 2 is a diagram illustrating a frame structure of a TDD mode in the prior art;
fig. 3 is a schematic diagram of positions of a downlink control channel and a downlink shared channel in a conventional CP in the prior art.
Fig. 4 is a flowchart of a transmission method of row control information according to an embodiment of the present invention;
FIG. 5 shows a first time-frequency position scene where a PDCCH is located according to an embodiment of the present invention;
fig. 6 shows a time-frequency position scene two where the PDCCH is located according to the embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in fig. 4, the embodiment of the present invention may be applied to an indoor hotspot coverage scenario of LTE, and the transmission of the downlink control channel information includes the following steps:
step 401, the base station sends downlink control information to the UE through a physical downlink control channel PDCCH on N subcarriers corresponding to the subframe.
Wherein, N is a positive integer, and the PDCCH is positioned on one or two time slots in a subframe; when the PDCCH is positioned on one time slot in a subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the time slot, and when the PDCCH is positioned on two time slots in the subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the subframe.
When the PDCCH is positioned on a first time slot of a subframe, the time domain starting position of the PDCCH is a first OFDM symbol of the first time slot of the subframe or an nth OFDM symbol of the first time slot of the subframe, and n is equal to an indicated value of a physical control format indicator channel of the subframe plus 1;
and when the PDCCH is positioned on the second time slot of the subframe, the time domain starting position of the PDCCH is the first OFDM symbol of the second time slot of the subframe.
When the PDCCH is positioned on two time slots of a subframe, the time domain starting position of the PDCCH is the first OFDM symbol of the first time slot of the subframe or the nth OFDM symbol of the first time slot of the subframe, and n is equal to the indicated value of the physical control format indicator channel of the subframe plus 1.
As shown in fig. 5, the time-frequency position of the PDCCH of the LTE-LAN may be the same as the time-domain position of the PDSCH channel of the subframe, or as shown in fig. 6, the time-domain position of the PDCCH of the LTE-LAN may be all the time-domain positions of the subframe.
In addition, the time-frequency resources used for transmitting the physical broadcast channel and the synchronization channel on the subframe are not used for transmitting the downlink control information.
In this step, the base station carries the shared channel scheduling information of the uplink serving cell and/or the shared channel scheduling information of the downlink serving cell in the downlink control information, and sends the downlink control information to the UE.
Specifically, the base station may carry the shared channel scheduling information of the downlink serving cell in the downlink control information of the first time slot of the subframe, carry the shared channel scheduling information of the uplink serving cell in the downlink control information of the second time slot of the subframe, and send the information to the UE;
or, the shared channel scheduling information of the downlink serving cell and the shared channel scheduling information of the uplink serving cell may be carried in the downlink control information of the first or second time slot and sent to the UE.
The frequency domain position of the PDCCH can adopt a distributed virtual resource block mode or a centralized virtual resource block mode.
In addition, the base station may send a high layer signaling carrying aggregation level information and/or PDCCH candidate number information to the UE, so that the UE configures the aggregation level and the PDCCH candidate number. The method for configuring the high-level signaling can enable the UE to monitor the same number of PDCCH candidate numbers or aggregation levels when each subframe does not need to monitor the PDCCH through the transmission of the high-level signaling, so that the monitoring times can be reduced, the transmission power of the terminal UE can be reduced, and the problem of the blockage of each PDCCH channel during the monitoring can be reduced.
Step 402, the UE monitors a physical downlink control channel PDCCH in a search space according to aggregation level information and/or PDCCH candidate number information configured by a high-level signaling, and acquires downlink control information.
When the UE monitors the PDCCH only according to the aggregation level information configured by the high-level signaling, the UE monitors the PDCCH according to the configured aggregation level information and the PDCCH candidate number corresponding to the aggregation level as in LTE or LTE-A; or, the UE allocates the corresponding number of PDCCH candidates to the configured aggregation level according to the configured aggregation level information and the principle that the total number of PDCCH candidates of all the aggregation levels is not changed, and carries out PDCCH monitoring.
When the UE monitors the PDCCH only according to the PDCCH candidate number information configured by the high-level signaling, the PDCCH candidate number information is the total PDCCH candidate number of all aggregation levels, or the PDCCH candidate number information is the PDCCH candidate number corresponding to each aggregation level.
When the UE monitors the PDCCH according to the aggregation level information and the PDCCH candidate number information configured by the high-level signaling, the base station informs the UE of the aggregation level information and the PDCCH candidate number information through two independent signaling; or the base station informs the UE of the aggregation level information and the PDCCH candidate number information through a joint coding signaling.
And if the UE does not receive the high-level signaling sent by the base station on a subframe, monitoring the PDCCH according to the high-level signaling carrying the aggregation level information and/or the PDCCH candidate number information at the last time.
Correspondingly, the sending device of the downlink control information of the embodiment of the invention is applied to a base station, and the sending device is used for sending the downlink control information to UE through a physical downlink control channel PDCCH on N subcarriers corresponding to a subframe;
wherein, N is a positive integer, and the PDCCH is positioned on one or two time slots in a subframe; when the PDCCH is positioned on one time slot in a subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the time slot, and when the PDCCH is positioned on two time slots in the subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the subframe.
When the PDCCH is positioned on a first time slot of a subframe, the time domain starting position of the PDCCH is a first OFDM symbol of the first time slot of the subframe or an nth OFDM symbol of the first time slot of the subframe, and n is equal to an indicated value of a physical control format indicator channel of the subframe plus 1;
and when the PDCCH is positioned on the second time slot of the subframe, the time domain starting position of the PDCCH is the first OFDM symbol of the second time slot of the subframe.
When the PDCCH is positioned on two time slots of a subframe, the time domain starting position of the PDCCH is the first OFDM symbol of the first time slot of the subframe or the nth OFDM symbol of the first time slot of the subframe, and n is equal to the indicated value of the physical control format indicator channel of the subframe plus 1.
The transmitting device may include an encapsulation module and a transmitting module, wherein,
the encapsulation module is used for carrying the shared channel scheduling information of the uplink service cell and/or the shared channel scheduling information of the downlink service cell on the downlink control information;
and the sending module is used for sending the downlink control information to the UE through a Physical Downlink Control Channel (PDCCH) on N subcarriers corresponding to the subframes.
The encapsulation module may be further configured to encapsulate the shared channel scheduling information of the downlink serving cell in the downlink control information of the first time slot of the subframe, and carry the shared channel scheduling information of the uplink serving cell in the downlink control information of the second time slot of the subframe; or, encapsulating the shared channel scheduling information of the downlink serving cell and the shared channel scheduling information of the uplink serving cell in the downlink control information of the first or second time slot.
The downlink control information receiving device of the embodiment of the invention is applied to UE and comprises a monitoring module and a receiving module which are connected, wherein,
the monitoring module is used for monitoring a Physical Downlink Control Channel (PDCCH) in a search space according to aggregation level information and/or PDCCH candidate number information configured by a high-level signaling;
the receiving module is used for acquiring downlink control information according to the PDCCH monitored by the monitoring module.
When monitoring the PDCCH only according to the aggregation level information configured by the high-level signaling, the monitoring module can be further used for monitoring the PDCCH according to the configured aggregation level information and the PDCCH candidate number corresponding to the aggregation level as in LTE or LTE-A; or distributing the corresponding PDCCH candidate number to the configured aggregation level according to the configured aggregation level information and the principle that the total PDCCH candidate number of all the aggregation levels is unchanged, and carrying out PDCCH monitoring.
The monitoring module may be further configured to monitor the PDCCH according to the high layer signaling carrying the aggregation level information and/or the PDCCH candidate number information last time if the high layer signaling sent by the base station is not received on a subframe.
The invention is further illustrated below in specific application examples.
Application example 1
In an LTE or LTE-advanced indoor hotspot coverage scenario, which may also be referred to as an LTE-LAN scenario, OFDM symbol positions transmitted by a downlink control channel PDCCH in all subframes of a radio frame may be set as follows:
the first method is as follows:
the PDCCH of LTE or LTE-a is indicated by information in the PCFICH to be transmitted on OFDM symbols 0-2 of the first slot of one subframe, while the PDSCH and other channels are transmitted on the remaining OFDM symbols. The PDCCH of the LTE-LAN is transmitted using a segment of frequency domain resources (one or more contiguous subcarriers) corresponding to the PDSCH. As shown in fig. 5. And the time domain position of the PDCCH corresponding to the LTE-LAN is consistent with the time domain position of the PDSCH on the subframe.
The PDCCH of the LTE-LAN of the first time slot can be used for resource scheduling of a downlink serving cell and the like, and the PDCCH of the LTE-LAN of the second time slot can be used for resource scheduling of an uplink serving cell and the like; or each time slot can be used for resource scheduling of uplink and downlink serving cells.
Or, the PDCCH transmission of the LTE-LAN is performed only in one of the time slots (e.g. time slot 1), and is used for resource scheduling of the uplink and downlink serving cells.
The frequency domain position of the PDCCH of the LTE-LAN can be in a distributed virtual resource block mode or a centralized virtual resource block mode.
The second method comprises the following steps:
the PDCCH of the LTE-LAN is transmitted using a segment of frequency domain resources (one or more contiguous subcarriers) at all OFDM symbol time domain positions of one subframe, as shown in fig. 6. And the time domain position of the PDCCH of the LTE-LAN is the whole time domain position of the subframe.
The PDCCH of the LTE-LAN of the first time slot can be used for resource scheduling of a downlink serving cell and the like, and the PDCCH of the LTE-LAN of the second time slot is used for resource scheduling of an uplink serving cell and the like; or each time slot can be used for resource scheduling of uplink and downlink serving cells.
Or, the PDCCH transmission of the LTE-LAN is performed only in one of the time slots (e.g. time slot 1), and is used for resource scheduling of the uplink and downlink serving cells.
The frequency domain position of the PDCCH of the LTE-LAN can be in a distributed virtual resource block mode or a centralized virtual resource block mode.
Application example two
In an indoor hotspot coverage scenario of LTE or LTE-Advance, which may also be referred to as an LTE-LAN scenario, after a base station sends downlink control channel information, a UE monitors a corresponding DCI format through a transmission mode configured by the base station, where the monitoring modes may be as follows:
the first method is as follows:
when the UE monitoring is configured through high-level signaling, the monitoring needs to be carried out according to which aggregation level (aggregation level) or aggregation levels, and the monitoring refers to the monitoring in a public search space and a UE-specific search space. The number of PDCCH candidates (PDCCHcandidate) that need to be monitored per aggregation level is different from that specified in LTE/LTE-a, but the number of PDCCH candidates that need to be monitored in total is the same as that specified in LTE/LTE-a.
For example, higher layer signaling informs the UE to use aggregation levels 1 and 2 for PDCCH monitoring, then the monitoring mode under this carrier may be as in table 2:
TABLE 2
Wherein a + B ═ 4. And the monitoring mode of the public search space is kept unchanged from LTE/LTE-A.
If the UE does not receive the aggregation level information notified by the higher layer signaling in a subframe, the aggregation level information notified by the higher layer signaling at the last time is carried over.
The second method comprises the following steps:
when the UE monitoring is configured through high-level signaling, the monitoring needs to be carried out according to which aggregation level (aggregation level) or aggregation levels, and the monitoring refers to the monitoring in a public search space and a UE-specific search space. The number of PDCCH candidates (PDCCHCandidate) that need to be monitored at each aggregation level is the same as that prescribed in LTE/LTE-A, and the number of PDCCH candidates that need to be monitored in total is different from that prescribed in LTE/LTE-A.
For example, higher layer signaling informs the UE to use aggregation levels 1 and 2 for PDCCH monitoring, then the monitoring mode under this carrier may be as shown in table 3:
TABLE 3
And the monitoring mode of the public search space is kept unchanged from LTE/LTE-A. This reduces the number of monitored PDCCH candidates when aggregating classes 4 and 8 compared to LTE/LTE-A.
The third method comprises the following steps:
and the base station informs the PDCCH candidate number of each aggregation level or informs the total PDCCH candidate number through high-level signaling.
TABLE 4
As shown in table 4, there is a higher layer signaling notification that the number of PDCCH candidates corresponding to the aggregation level of each UE-specific search space is 10, 6, 0, and 0, respectively, and the number of PDCCH candidates corresponding to the aggregation level of the common search space is 4 and 2.
The method four comprises the following steps:
the base station informs the UE of monitoring the aggregation level of the PDCCH and the number of PDCCH candidates through high-level signaling, and can adopt an independent signaling mode or a joint coding mode.
If the UE does not receive the aggregation level information and the number of PDCCH candidates notified by the high-level signaling in a subframe, the aggregation level information and the number of PDCCH candidates notified by the high-level signaling at the last time are delayed.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the foregoing embodiments may also be implemented by using one or more integrated circuits, and accordingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A method for sending downlink control information comprises the following steps:
a base station sends downlink control information to User Equipment (UE) through a Physical Downlink Control Channel (PDCCH) on N subcarriers corresponding to a subframe;
wherein, N is a positive integer, and the PDCCH is positioned on one or two time slots in a subframe; when the PDCCH is positioned on one time slot in a subframe, the time domain termination position of the PDCCH is the last Orthogonal Frequency Division Multiplexing (OFDM) symbol of the time slot, and when the PDCCH is positioned on two time slots in the subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the subframe.
2. The transmission method of claim 1,
when the PDCCH is positioned on a first time slot of a subframe, the time domain starting position of the PDCCH is a first OFDM symbol of the first time slot of the subframe or an nth OFDM symbol of the first time slot of the subframe, and n is equal to an indicated value of a physical control format indicator channel of the subframe plus 1;
and when the PDCCH is positioned on the second time slot of the subframe, the time domain starting position of the PDCCH is the first OFDM symbol of the second time slot of the subframe.
3. The transmission method of claim 1,
when the PDCCH is positioned on two time slots of a subframe, the time domain starting position of the PDCCH is the first OFDM symbol of the first time slot of the subframe or the nth OFDM symbol of the first time slot of the subframe, and n is equal to the indicated value of the physical control format indicator channel of the subframe plus 1.
4. The transmission method of claim 1,
and the time-frequency resources used for sending the physical broadcast channel and the synchronous channel on the subframe are not used for sending the downlink control information.
5. The transmission method of claim 1,
and the base station carries the shared channel scheduling information of the uplink service cell and/or the shared channel scheduling information of the downlink service cell in the downlink control information and sends the downlink control information to the UE.
6. The transmission method of claim 5,
the base station carries the shared channel scheduling information of the downlink service cell in the downlink control information of the first time slot of the subframe, carries the shared channel scheduling information of the uplink service cell in the downlink control information of the second time slot of the subframe and sends the shared channel scheduling information of the downlink service cell to the UE;
or, the shared channel scheduling information of the downlink serving cell and the shared channel scheduling information of the uplink serving cell are carried in the downlink control information of the first or second time slot and sent to the UE.
7. The transmission method according to any one of claims 1 to 6,
and the frequency domain position of the PDCCH adopts a distributed virtual resource block mode or a centralized virtual resource block mode.
8. The transmission method according to any one of claims 1 to 6, wherein the method is suitable for a scene covered by indoor hot spots.
9. A method for receiving downlink control information comprises the following steps:
the UE monitors a Physical Downlink Control Channel (PDCCH) in a search space according to the PDCCH candidate number information configured by the high-level signaling to acquire downlink control information;
when the UE monitors PDCCH only according to the PDCCH candidate number information configured by the high-layer signaling,
the PDCCH candidate number information is the PDCCH candidate number corresponding to each aggregation level;
and if the UE does not receive the high-level signaling sent by the base station on a subframe, monitoring the PDCCH according to the high-level signaling carrying the PDCCH candidate number information at the last time.
10. The receiving method of claim 9,
the method is suitable for scenes covered by indoor hot spots.
11. A method for transmitting downlink control information includes:
a base station sends downlink control information to UE through a physical downlink control channel PDCCH on N subcarriers corresponding to a subframe;
UE monitors a Physical Downlink Control Channel (PDCCH) in a search space according to aggregation level information and/or PDCCH candidate number information configured by a high-level signaling to acquire downlink control information;
wherein, N is a positive integer, and the PDCCH is positioned on one or two time slots in a subframe; when the PDCCH is positioned on one time slot in a subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the time slot, and when the PDCCH is positioned on two time slots in the subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the subframe.
12. A transmission apparatus of downlink control information is characterized in that,
the sending device is used for sending downlink control information to the UE through a Physical Downlink Control Channel (PDCCH) on N subcarriers corresponding to the subframes;
wherein, N is a positive integer, and the PDCCH is positioned on one or two time slots in a subframe; when the PDCCH is positioned on one time slot in a subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the time slot, and when the PDCCH is positioned on two time slots in the subframe, the time domain termination position of the PDCCH is the last OFDM symbol of the subframe.
13. The device for receiving the downlink control information is characterized by comprising a monitoring module and a receiving module, wherein,
the monitoring module is used for monitoring a Physical Downlink Control Channel (PDCCH) on a search space according to the PDCCH candidate number information configured by the high-level signaling;
when the UE monitors the PDCCH only according to the PDCCH candidate number information configured by the higher layer signaling,
the PDCCH candidate number information is the PDCCH candidate number corresponding to each aggregation level;
the receiving module is used for acquiring downlink control information according to the PDCCH monitored by the monitoring module;
and if the UE does not receive the high-level signaling sent by the base station on a subframe, monitoring the PDCCH according to the high-level signaling carrying the PDCCH candidate number information at the last time.
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